I wanted a recognizable sea shell and doodled around until I found a suitable design. In one rendition I was doing joins in between doublestitches because the rings had to be so tiny. Itsy bitsy rings and some really fiddly work, but it looks like a shell and it still holds it's concave shape although you could block the life out of it to make it lie flat. It's designed to cup just a tiny bit. Anyway, when I saw folks wanted it, I posted it to my web site. It's on my web site now at http://www.rsbriggs.com/ in the Free Patterns at the bottom of the page.
Note: Click on the Legend link on the right for an explanation of the icons used in the pattern.